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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities |  |
Net loss | $ (72,508) | $ (37,412)
Adjustments to reconcile net loss to net cash used by operating activities |  |
Stock-based compensation | 16,091 | 12,492
Depreciation and amortization | 3,573 | 2,561
Bad debt expense | (1) | 32
Change in fair value of available-for-sale securities | 0 | (31)
Deferred income taxes | (1,302) | (144)
Changes in assets and liabilities |  |
Accounts receivable | 12,132 | 16,720
Prepaid expenses and other assets | (5,334) | 243
Deferred commissions | (1,777) | (7,340)
Accounts payable and accrued expenses | 2,098 | 3,000
Accrued compensation and related benefits | (4,923) | 2,808
Other current and non-current liabilities | (395) | (563)
Deferred revenue | 2,990 | (1,791)
Operating lease liabilities | (905) | 52
Net cash used by operating activities | (50,261) | (9,373)
Cash flows from investing activities |  |
Purchases of investments | (31,214) | 0
Proceeds from investments | 36,473 | 27,604
Purchases of property and equipment | (4,685) | (1,027)
Net cash provided by investing activities | 574 | 26,577
Cash flows from financing activities |  |
Proceeds from exercise of common stock options | 25,030 | 2,089
Net cash provided by financing activities | 25,030 | 2,089
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | (205) | (476)
Net (decrease) increase in cash, cash equivalents, and restricted cash | (24,862) | 18,817
Cash, cash equivalents, and restricted cash at beginning of period | 103,960 | 112,462
Cash, cash equivalents, and restricted cash at end of period | 79,098 | 131,279
Supplemental disclosure of cash flow information |  |
Cash paid for interest | 145 | 173
Cash paid for income taxes | 524 | 806
Supplemental disclosure of non-cash investing and financing activities |  |
Accrued capital expenditures | $ 96 | $ 0

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